Discovery of an Internasal Bone in Hynobius maoershanensis(Urodela:Hynobiidae)  

作　　者：Jianli XIONG Xiuying LIU Xiaomao ZENG 

机构地区：[1]Animal Science and Technology College,Henan University of Science and Technology [2]School of Agriculture,Henan University of Science and Technology [3]Chengdu Institute of Biology,Chinese Academy of Sciences

出　　处：《Asian Herpetological Research》2011年第2期87-90,共4页亚洲两栖爬行动物研究（英文版）

基　　金：supported by the grants of the National Natural Science Foundation of China(NSFC)(30870287);the Chinese Academy of Sciences(KSCX2-EW-J-22)to Xiaomao ZENG;the grants of NSFC(30900138)and Henan University of Science and Technology Foundation(09001367)to Jianli XIONG

摘　　要：Internasal bones have generally been recorded in teleostean and tetrapod fossils, being absent in most extant vertebrates. Presently, there has been one case of the internasal bone discovered in a living salamander, Pseudohynobius puxiongensis （Caudata： Hynobiidae）. The second case discovered in living salamanders is reported in this article, which is present in one of five specimens ofHynobius maoershanensis, a species endemic to China. This case is again regarded as individual variation. Thus, the presence of an ＂internasal bone＂ may represent intraspecific variation and is thus a misleading taxonomic character.Internasal bones have generally been recorded in teleostean and tetrapod fossils, being absent in most extant vertebrates. Presently, there has been one case of the internasal bone discovered in a living salamander, Pseudohynobius puxiongensis （Caudata： Hynobiidae）. The second case discovered in living salamanders is reported in this article, which is present in one of five specimens ofHynobius maoershanensis, a species endemic to China. This case is again regarded as individual variation. Thus, the presence of an ＂internasal bone＂ may represent intraspecific variation and is thus a misleading taxonomic character.

关 键 词：SALAMANDER intemasal bone SKULL ANATOMY individual variation 

分 类 号：Q915[天文地球—古生物学与地层学]